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Wednesday, 12 May 2021 08:30

Microsoft issues 55 patches; Adobe on Windows under attack Featured

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Microsoft issues 55 patches; Adobe on Windows under attack Image by OpenClipart-Vectors from Pixabay

Microsoft has issued fixes for 55 vulnerabilities in its products as part of its monthly patch Tuesday. Four of the issues are rated critical, the most severe rating available.

Adobe also released patches and an update for Acrobat and Reader on Windows fixes at least one bug that is being exploited in the wild.

A number of patches were also issued for the Adobe Illustrator product and all are rated critical.

Of the vulnerability being currently exploited, Dustin Childs of the Zero Day Initiative, said: "The bug (CVE-2021-28550) is one of three use after free bugs addressed by this patch. These and other vulnerabilities could lead to code execution if someone were to open a specially crafted PDF with an affected version of Acrobat or Reader.

"The update for InDesign also stands out. These bugs result from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated structure. An attacker can leverage this vulnerability to execute code in the context of the current process."

Microsoft issued a number of patches for its Microsoft Exchange Server mail transport agent, following the rash of patches for the same product issued over March and April.

There were two patches each for Exchange Server 2016 and 2019, and a single path for the 2013 version, with all rated moderate.

Childs rated the following vulnerabilities as the ones to be patched right away, with the first two being classified as critical:

CVE-2021-31166 – HTTP Protocol Stack Remote Code Execution Vulnerability, a bug that is wormable.

CVE-2021-28476 – Hyper-V Remote Code Execution Vulnerability which could be used for a DoS attack.

CVE-2021-27068 – Visual Studio Remote Code Execution Vulnerability could allow code execution.

CVE-2020-24587 – Windows Wireless Networking Information Disclosure Vulnerability

Of the Exchange patches, Childs said some were related to bugs disclosed during the recent Pwn2Own hacking contest.

"Two of the patches correct remote code execution bugs," he said. "While it appears these bugs result from Pwn2Own submissions, the exploits used during the contest did not require user interaction.

"The write-up from Microsoft does list user interaction in the CVSS score. However they may be scoring just this piece of the exploit chain.

"There’s also a spoofing bug and a security feature bypass that were used at the contest as part of a multi-bug chain.

"More Exchange patches are expected as not everything disclosed at the contest has been addressed. We’re working with Microsoft to get further clarification."


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Sam Varghese

Sam Varghese has been writing for iTWire since 2006, a year after the site came into existence. For nearly a decade thereafter, he wrote mostly about free and open source software, based on his own use of this genre of software. Since May 2016, he has been writing across many areas of technology. He has been a journalist for nearly 40 years in India (Indian Express and Deccan Herald), the UAE (Khaleej Times) and Australia (Daily Commercial News (now defunct) and The Age). His personal blog is titled Irregular Expression.

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